Hello all, according to the FSM the torque specs for the water pump to water pump housing specs are 10 Nm. Since this seems like just a bit beyond finger tight, is it right?

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.

10nm is definitely beyond finger tight unless you've got crazy fingers.

That said yes it's right. The gasket does the sealing. The bolts just need to be tight enough to not back out.

10nm is also the torque for the thermostat cover bolts, working fine on my car so far after a recent replacement. They aren't very big bolts. I remember when doing my water pump I almost twisted the head off of one without crazy effort. I didn't have a torque wrench those many years ago...

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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

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Without knowing what you are working on, it would be tough to say.

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Sorry about that, my car was in my profile, and I've now added to my signature to help.

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.

Thank you, it just seemed to be so little torque, when the wrench clicked, I'd set it to 8 Lbs. Ft. (my cheat sheet says, 7.4 lbs feet is equal to 10 Nm).

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.

Ummmm...and don't go beyond the stated torque elsewise you can plan on fighting to remove a broken bolt...that's on my summer to do list...live and learn I didn't set the torque wrench quite right

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1985 300D 172,110mi and goin' strong

10 Nm = 7.37561 LB FT.


FYI for owners.......

Torque Wrenches, calibration, accuracy.

Torque wrench, use it correctly or damage precision parts with brute force

Torque wrench recommendations

....................

Torque to Yield Bolts

US & Metric Bolt Torque by Grade

Extracting Broken Bolts, Studs, Extractors, Drill bits, and Taps

.

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1985 300SD
1983 300D
2003 Volvo V70

https://www.boldegoist.com/

Yup another BTDT on a OM61x engine.

Those bolts are extremely delicate. If the gasket seal is not perfect, the bolt neck can rust, and then when you try to back one out, *snap*

Fortunately the pump housing can be removed and replaced without too much difficulty. And the housing from a OM617 will cross to an OM616.

It sort of looks like Aladdin's lamp or a smoking device depending on your perspective.

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Still going strong
2014 ML350 Bluetec (wife's DD)
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both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech